Looks like it got screenshots form some western VN accidentally got added as a screenshot for it.Play the game and take some screenshots and it'll replace the store page screenshots with yours on your library.

You probably shouldn't have made a thread over this since it's likely going to turn into a piratefag vs buyfag war zone but whatever.

Games that are no longer sold on Steam get this bug, I have the same case for the original Deus Ex:HR game (it gets sometimes a DMC5 screenshot as a background banner). That said, I prefer using small mode to browse my library in general